How to read a file in in C++
// io/read-file-sum.cpp - Read integers from file and print sum. // Fred Swartz 2003-08-20 #include <iostream> #include <iomanip> #include <fstream> using namespace std; int main() { int sum = 0; int x; ifstream inFile; inFile.open("test.txt"); if (!inFile) { cout << "Unable to open file"; exit(1); // terminate with error } while (inFile >> x) { sum = sum + x; } inFile.close(); cout << "Sum = " << sum << endl; return 0; }
opening file in c++
/ fstream::open / fstream::close #include <fstream> // std::fstream int main () { std::fstream fs; fs.open ("test.txt", std::fstream::in | std::fstream::out | std::fstream::app); fs << " more lorem ipsum"; fs.close(); return 0; }
write to file in C++
ofstream myfile; myfile.open("file.txt"); myfile << "write this to file"
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